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以Fe3O4纳米粒子为磁核,借助紫外光辐照含有烯丙基胺和N,N′-亚甲基双丙烯酰胺的水溶液,制备了胺基功能化的聚(烯丙基胺-共-N,N′-亚甲基双丙烯酰胺)磁性纳米凝胶(PAAm-Fe3O4),对其化学组成、表面电位、形貌、粒径分布及磁学性质进行了分析表征,并研究了光照时间和单体的滴加量对产物的粒径和粒径分布的影响.为探索聚合反应的引发方式,以烯丙基胺的类似物——苯胺为探针,借助激光光解-瞬态吸收装置研究了纳米Fe3O4粒子与有机电子供体的相互作用.结果表明,光化学方法实现了高分子凝胶层对单个Fe3O4粒子的有效包覆,通过控制光照时间和单体的滴加量可以获得在一定范围内尺寸可调且分布较窄的PAAm-Fe3O4.核壳结构的PAAm-Fe3O4近似球形,表面带正电性,磁含量接近88%,在室温下呈现准超顺磁性且饱和磁化强度达50emug?1.激光光解实验结果表明在光化学反应条件下Fe3O4与有机电子供体发生了电子转移反应,这可能是在Fe3O4表面引发有机胺单体的聚合并形成高分子壳的关键.最后,对PAAm-Fe3O4的形成机理进行了探讨.
Amino functionalized poly (allylamine-co-N-co-N-co-N , N’-methylene bisacrylamide) magnetic nanogel (PAAm-Fe3O4) were synthesized and characterized by chemical composition, surface potential, morphology, particle size distribution and magnetic properties. The effects of illumination time and The amount of monomer on the product size and particle size distribution.In order to explore the initiation of the polymerization reaction, with allylamine analogue - aniline as a probe, with laser photolysis - transient absorption device The interaction between nano-Fe3O4 particles and organic electron donors was studied. The results show that the photochemical method can effectively coat the single Fe3O4 particles by controlling the light irradiation time and the amount of monomer added. PAAm-Fe3O4 with adjustable size and narrower distribution.The PAAm-Fe3O4 core-shell structure is nearly spherical with a positive charge of 88%, a paramagnetic superparamagnetism at room temperature and a saturation magnetization of 50emug 1. Laser photolysis experiment results show that under photochemical reaction conditions Fe3O4 with an organic electron donor electron transfer reaction occurs, which may be the key to initiate polymerization of the organic amine monomer and form a polymer on the surface of Fe3O4 shell. Finally, the formation mechanism of PAAm-Fe3O4 were discussed.